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PIP-HS/MS Series Parallel Installation Guide
1. Introduction
This inverter can be used in parallel with two different operation modes.
1. Parallel operation in single phase with up to 6 units.
The supported maximum output power is
24KW/30KVA.
2. Maximum six units work together to support three-phase equipment. Four units support one phase
maximum. The supported maximum output power is 24KW/30KVA and one phase can be up to
16KW/20KVA.
NOTE: If this unit is bundled with share current cable and parallel cable, this inverter is default supported
parallel operation. You may skip section 3. If not, please purchase parallel kit and install this unit by following
instruction from professional technical personnel in local dealer.
2. Package Contents
In parallel kit, you will find the following items in the package:
Parallel board
Parallel communication cable
Current sharing cable
3. Parallel board installation
This installation steps are only applied to 4K/5K models.
Step 1: Remove wire cover by unscrewing all screws.
Step 2: Remove communication board by unscrewing two screws as below chart.
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Step 3: Remove two screws as below chart and remove 2-pin and 14-pin cables. Take out the board under the
communication board.
Step 4: Remove two screws as below chart to take out cover of parallel communication.
Step 5: Install new parallel board with 2 screws tightly.
Step 6: Re-connect 2-pin and 14-pin to original position.
Parallel board
Communication board
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Step 7: Put communication board back to the unit.
Step 8: Put wire cover back to the unit. Now the inverter is providing parallel operation function.
4. Mounting the Unit
When installing multiple units, please follow below chart.
NOTE: For proper air circulation to dissipate heat, allow a clearance of approx. 20 cm to the side and approx.
50 cm above and below the unit. Be sure to install each unit in the same level.
5. Wiring Connection
The cable size of each inverter is shown as below:
Recommended battery cable and terminal size for each inverter:
Ring Terminal
Torque
Cable
Dimensions
Model
Wire Size
value
D (mm)
L (mm)
mm2
4KVA
5KVA
1*4AWG
22
6.4
33.2
2*8AWG
14
6.4
29.2
1*4AWG
22
6.4
33.2
2*8AWG
14
6.4
29.2
Ring terminal:
2~ 3 Nm
2~ 3 Nm
WARNING: Be sure the length of all battery cables is the same. Otherwise, there will be voltage difference
between inverter and battery to cause parallel inverters not working.
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Recommended AC input and output cable size for each inverter:
Model
AWG no.
Torque
4KVA
10 AWG
1.4~1.6Nm
5KVA
8 AWG
1.4~1.6Nm
You need to connect the cables of each inverter together. Take the battery cables for example: You need to
use a connector or bus-bar as a joint to connect the battery cables together, and then connect to the battery
terminal. The cable size used from joint to battery should be X times cable size in the tables above. “X”
indicates the number of inverters connected in parallel.
Regarding AC input and output, please also follow the same principle.
CAUTION!! Please install the breaker at the battery and AC input side. This will ensure the inverter can be
securely disconnected during maintenance and fully protected from over current of battery or AC input. The
recommended mounted location of the breakers is shown in the figures in 5-1 and 5-2.
Recommended breaker specification of battery for each inverter:
Model
1 unit*
4KVA
80A/60VDC
5KVA
100A/60VDC
*If you want to use only one breaker at the battery side for the whole system, the rating of the breaker should
be X times current of 1 unit. “X” indicates the number of inverters connected in parallel.
Recommended breaker specification of AC input with single phase:
Model
2 units
3 units
4 units
5 units
6 units
4KVA
80A/230VAC
120A/230VAC
160A/230VAC
200A/230VAC
240A/230VAC
5KVA
100A/230VAC
150A/230VAC
200A/23VAC
250A/23VAC
300A/23VAC
Note1: Also, you can use 40A breaker (50A for 5KVA) for only 1 unit, and each inverter has a breaker at its AC
input.
Note2: Regarding three phase system, you can use 4 poles breaker, the rating is up to the current of the
phase which has the maximum units. Or you can follow the suggestion of note 1.
Recommended battery capacity
Inverter parallel numbers
2
3
4
5
6
Battery Capacity
400AH
600AH
800AH
1000AH
1200AH
WARNING! Be sure that all inverters will share the same battery bank. Otherwise, the inverters will transfer
to fault mode.
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5-1. Parallel Operation in Single phase
Two inverters in parallel:
Power Connection
N
L
N
Load
L
Communication Connection
Three inverters in parallel:
Power Connection
N
L
N
Load
L
5
Communication Connection
Four inverters in parallel:
Power Connection
N
L
N
Load
L
Communication Connection
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Five inverters in parallel:
Power Connection
N
L
N
Load
L
Communication Connection
Six inverters in parallel:
Power Connection
N
L
N
Load
L
Communication Connection
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5-2. Support 3-phase equipment
Two inverters in each phase:
Power Connection
P1
P2
P3
N
L1
L2
L3
Load
N
L1
L2
L3
Communication Connection
Four inverters in one phase and one inverter for the other two phases:
Power Connection
P2
P1
N
L1
L2
L3
Load
N
L1
L2
L3
Note: It’s up to customer’s demand to pick 4 inverters on any phase.
P1: L1-phase, P2: L2-phase, P3: L3-phase.
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P3
Communication Connection
Three inverters in one phase, two inverters in second phase and one inverter for the third phase:
Power Connection
P1
P2
N
L1
L2
L3
Load
N
L1
L2
L3
Communication Connection
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P3
Three inverters in one phase and only one inverter for the remaining two phases:
Power Connection
P2
P1
P3
N
L1
L2
L3
Load
N
L1
L2
L3
Communication Connection
Two inverters in two phases and only one inverter for the remaining phase:
Power Connection
P1
P2
N
L1
L2
L3
Load
N
L1
L2
L3
10
P3
Communication Connection
Two inverters in one phase and only one inverter for the remaining phases:
Power Connection
P2
P1
N
L1
L2
L3
Load
N
L1
L2
L3
Communication Connection
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P3
One inverter in each phase:
Power Connection
P2
P1
P3
N
L1
L2
L3
Load
N
L1
L2
L3
Communication Connection
WARNING: Do not connect the current sharing cable between the inverters which are in different phases.
Otherwise, it may damage the inverters.
6. PV Connection
Please refer to user manual of single unit for PV Connection.
CAUTION: Each inverter should connect to PV modules separately.
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7. LCD Setting and Display
Setting Program:
Program
Description
Selectable option
Single:
When the units are used in parallel with
single phase, please select “PAL” in program
28.
It is required to have at least 3 inverters or
maximum 6 inverters to support
three-phase equipment. It’s required to
have at least one inverter in each phase or
it’s up to four inverters in one phase. Please
refers to 5-2 for detailed information.
Please select “3P1” in program 28 for the
inverters connected to L1 phase, “3P2” in
program 28 for the inverters connected to
L2 phase and “3P3” in program 28 for the
inverters connected to L3 phase.
Parallel:
28
AC output mode
*This setting is only
available when the
inverter is in standby
mode (Switch off).
L1 phase:
L2 phase:
Be sure to connect share current cable to
units which are on the same phase.
Do NOT connect share current cable
between units on different phases.
L3 phase:
Besides, power saving function will be
automatically disabled.
One Inverter
(Default):
30
PV judge condition
(Only apply for
setting “Solar first”
in program 1: Output
source priority)
All of Inverters:
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When “ONE” is selected, as long as one of
inverters has been connected to PV
modules and PV input is normal, parallel or
3-phase system will continue working
according to rule of “solar first” setting.
For example, two units are connected in
parallel and set “SOL” in output source
priority. If one of two units has connected to
PV modules and PV input is normal, the
parallel system will provide power to loads
from solar or battery power. If both of them
are not sufficient, the system will provide
power to loads from utility.
When “ALL” is selected, parallel or 3-phase
system will continue working according to
rule of “solar first” setting only when all of
inverters are connected to PV modules.
For example, two units are connected in
parallel and set “SOL” in output source
priority. When selecting “ALL” in program
30, it’s necessary to have all inverters
connected to PV modules and PV input is
normal to allow the system to provide
power to loads from solar and battery
power. Otherwise, the system will provide
power to loads from utility.
Fault code display:
Fault Code
Fault Event
60
Power feedback protection
71
Firmware version inconsistent
72
Current sharing fault
80
CAN fault
81
Host loss
82
Synchronization loss
83
Battery voltage detected different
84
AC input voltage and frequency detected different
85
AC output current unbalance
86
AC output mode setting is different
Icon on
8. Commissioning
Parallel in single phase
Step 1: Check the following requirements before commissioning:
 Correct wire connection
 Ensure all breakers in Line wires of load side are open and each Neutral wires of each unit are connected
together.
Step 2: Turn on each unit and set “PAL” in LCD setting program 28 of each unit. And then shut down all units.
NOTE: It’s necessary to turn off switch when setting LCD program. Otherwise, the setting can not be
programmed.
Step 3: Turn on each unit.
LCD display in Master unit
LCD display in Slave unit
NOTE: Master and slave units are randomly defined.
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Step 4: Switch on all AC breakers of Line wires in AC input. It’s better to have all inverters connect to utility at
the same time. If not, it will display fault 82 in following-order inverters. However, these inverters will
automatically restart. If detecting AC connection, they will work normally.
LCD display in Master unit
LCD display in Slave unit
Step 5: If there is no more fault alarm, the parallel system is completely installed.
Step 6: Please switch on all breakers of Line wires in load side. This system will start to provide power to the
load.
Support three-phase equipment
Step 1: Check the following requirements before commissioning:
 Correct wire connection
 Ensure all breakers in Line wires of load side are open and each Neutral wires of each unit are connected
together.
Step 2: Turn on all units and configure LCD program 28 as P1, P2 and P3 sequentially. And then shut down all
units.
NOTE: It’s necessary to turn off switch when setting LCD program. Otherwise, the setting can not be
programmed.
Step 3: Turn on all units sequentially.
LCD display in L3-phase unit
LCD display in L1-phase unit
LCD display in L2-phase unit
Step 4: Switch on all AC breakers of Line wires in AC input. If AC connection is detected and three phases are
matched with unit setting, they will work normally. Otherwise, the AC icon
will flash and they will not work
in line mode.
LCD display in L1-phase unit
LCD display in L2-phase unit
LCD display in L3-phase unit
Step 5: If there is no more fault alarm, the system to support 3-phase equipment is completely installed.
Step 6: Please switch on all breakers of Line wires in load side. This system will start to provide power to the
load.
Note 1: To avoid overload occurring, before turning on breakers in load side, it’s better to have whole system
in operation first.
Note 2: Transfer time for this operation exists. Power interruption may happen to critical devices, which cannot
bear transfer time.
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9. Trouble shooting
Situation
Fault
Code
60
71
72
80
81
82
83
84
85
86
Solution
Fault Event Description
Current feedback into
the inverter is
detected.
The firmware version
of each inverter is not
the same.
The output current of
each inverter is
different.
CAN data loss
Host data loss
Synchronization data
loss
The battery voltage of
each inverter is not the
same.
AC input voltage and
frequency are detected
different.
AC output current
unbalance
AC output mode
setting is different.
1.
2.
3.
4.
1.
2.
3.
Restart the inverter.
Check if L/N cables are not connected reversely in all inverters.
For parallel system in single phase, make sure the sharing are
connected in all inverters.
For supporting three-phase system, make sure the sharing cables are
connected in the inverters in the same phase, and disconnected in the
inverters in different phases.
If the problem remains, please contact your installer.
Update all inverter firmware to the same version.
Check the version of each inverter via LCD setting and make sure the
CPU versions are same. If not, please contact your instraller to provide
the firmware to update.
After updating, if the problem still remains, please contact your
installer.
1.
2.
Check if sharing cables are connected well and restart the inverter.
If the problem remains, please contact your installer.
1.
Check if communication cables are connected well and restart the
inverter.
If the problem remains, please contact your installer.
2.
1.
2.
3.
1.
2.
3.
1.
2.
3.
1.
2.
3.
Make sure all inverters share same groups of batteries together.
Remove all loads and disconnect AC input and PV input. Then, check
battery voltage of all inverters. If the values from all inverters are close,
please check if all battery cables are the same length and same
material type. Otherwise, please contact your installer to provide SOP
to calibrate battery voltage of each inverter.
If the problem still remains, please contact your installer.
Check the utility wiring conncetion and restart the inverter.
Make sure utility starts up at same time. If there are breakers installed
between utility and inverters, please be sure all breakers can be turned
on AC input at same time.
If the problem remains, please contact your installer.
Restart the inverter.
Remove some excessive loads and re-check load information from LCD
of inverters. If the values are different, please check if AC input and
output cables are in the same length and material type.
If the problem remains, please contact your installer.
Switch off the inverter and check LCD setting #28.
For parallel system in single phase, make sure no 3P1, 3P2 or 3P3 is set
on #28.
For upporting three-phase system, make sure no “PAL” is set on #28.
If the problem remains, please contact your installer.
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